| F | Striking force | θ | Contact angle |
| ρ | Liquid density (kg/m3) | p0 | Intensity of pressure(Mpa) |
| q | Liquid flow(m3/s) | V | Fluid velocity (m/s) |
| Q | Critical liquid flow(m3•min-1) | Vs | Critical fluid velocity (m/s) |
| A | The orifice cross area (m2) | τs | Shear strength (Mpa) |